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Assembly of functional carboxymethyl cellulose/polyethylene oxide/anatase TiO_(2) nanocomposites and tuning the dielectric relaxation, optical, and photoluminescence performances

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Journal of Semiconductors 2024年第7期45卷 26-38页

作者： Asmaa M.Ismail Abeer A.Reffaee fawzy G.El Desouky Spectroscopy Department Physics Research InstituteNational Research CentreGizaCairo 12622Egypt Microwave Physics and Dielectrics Department National Research CentreDokkiCairoEgypt Solid State Physics Department Physics Research InstituteNational Research CentreGizaCairo 12622Egypt

Nanocomposite films consisting of carboxymethyl cellulose,polyethylene oxide(CMC/PEO),and anatase titanium diox-ide(TO)were produced by the use of sol-gel and solution casting ***2 nanocrystals were effectively incorporated into CMC/PEO polymers,as shown by X-ray diffraction(XRD)and attenuated total reflectance fourier transform infrared(ATR-FTIR)*** roughness growth is at high levels of TO nanocrystals(TO NCs),which means increasing active sites and defects in CMC/*** differential scanning calorimetry(DSC)thermograms,the change in glass transition temperature(Tg)val-ues verifies that the polymer blend interacts with TO *** increment proportions of TO NCs have a notable impact on the dielectric performances of the nanocomposites,as *** electrical properties of the CMC/PEO/TO nanocomposite undergo significant *** nanocomposite films exhibit a red alteration in the absorption edge as the concentration of TO NCs increases in the polymer *** decline in the energy gap is readily apparent as the weight percentage of TO NCs *** photoluminescence(PL)emission spectra indicate that the sites of the luminescence peak maximums show slight variation;peaks get wider,while their intensities decrease dramatically as the concentration of TO *** nanocomposite materials show potential for multifunctional applications including optoelectronics,antireflection coatings,pho-tocatalysis,light emitting diodes,and solid polymer electrolytes.

关键词： anatase TiO_(2) CMC/PEO nanocomposites optical photoluminescent electrical optoelectronics

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A Comparative Analysis on Surgical Outcomes and Complications of Endoscopic and Open Vein Harvesting Techniques

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Open Journal of Thoracic Surgery 2024年第2期14卷 29-39页

作者： Mohammed fawzy Eltaweel Ismail N. El-Sokkary Ahmed Alherazi mohame. Wael Badawi Mohammed G. Abdellatif Bahaa A. Elkhonezy Ibrahim K. Gamil Haytham mohame. Abd El Moaty Sarra Sadmi Mahmoud Khalil Department of Cardiothoracic Surgery Faculty of Medicine Menoufia University Shibin El Kom Egypt Department of Cardiovascular & Thoracic Surgery Faculty of Medicine Al-Azhar University Cairo Egypt Department of Cardiothoracic Surgery Faculty of Medicine Alexandria University Alexandria Egypt Faculty of Medicine University of Algiers Algiers Algeria Department of Cardiac Surgery Sabah Al-Ahmed Cardiac Center Al-Amiri Hospital Kuwait City Kuwait

Objective: The great saphenous vein (GSV) is commonly used as a conduit for grafting during CABG surgery, and open GSV harvesting (OVH), commonly used with long incision to expose the vein. However, endoscopic vein harvesting (EVH) is an alternative approach, utilizing specialized instruments and small incisions to harvest the vein. Methods: A retrospective analysis was conducted on a cohort of patients who underwent Coronary artery bypass graft (CABG) requiring great saphenous vein (GSV) harvesting which was done by EVH or OVH procedures. Demographic variables, including age and gender, were assessed for both groups. Intraoperative variables such as the number of grafts, cardiopulmonary bypass time, X clamp time, and type of procedure were analyzed. Postoperative variables, including infection and bleeding rates, were also evaluated. Results: The study included 30 patients each undergoing Coronary artery bypass graft (CABG) with need of great saphenous vein harvesting which was done by EVH and OVH. Demographic variables were well-matched between the two groups in terms of age, while a significant difference in gender distribution was observed. Obesity and smoking were more prevalent in the OVH group, and EVH was associated with a higher mean number of grafts compared to OVH. Conversion to an open technique occurred in a portion of the EVH cases, and infection rates did not significantly differ between the EVH and OVH groups. However, the incidence of postoperative bleeding was significantly higher in the EVH group. Conclusion: This study provides valuable insights into the demographic, intraoperative, and postoperative variables associated with EVH and OVH techniques. EVH demonstrated advantages in terms of reduced infection rates compared to OVH. However, the higher incidence of postoperative bleeding associated with EVH raises concerns about potential risks.

关键词： Endoscopic Vein Harvesting (EVH) Open Vein Harvesting (OVH) Coronary Artery Bypass Grafting (CABG) Great Saphenous Vein (GSV) Surgical Outcomes

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Occurrence and ecotoxicological risk assessment of pesticides in sediments of the Rosetta branch,Nile River, Egypt

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Journal of Environmental Sciences 2022年第8期34卷 21-31页

作者： fawzy Eissa Mahmoud Al-Sisi Khaled Ghanem Environment and Bio-agriculture Department Faculty of AgricultureAl-Azhar UniversityNasr CityCairo 11884Egypt Central Laboratory of Residue Analysis of Pesticides and Heavy Metals in Food(QCAP) Agricultural Research CenterDokkiGiza 12311Egypt

This study aimed to(1) monitor the occurrence and spatiotemporal variations of 100 pesticides in sediments collected monthly from July 2018 to June 2019 from sampling sites in El-Rahawy, Sabal, and Tala, along the Rosetta branch of the Nile River, Egypt, and(2) perform an ecological risk assessment for aquatic organisms upon exposure to the detected sediment pesticides based on the risk quotient(RQ) method. Out of the 100 pesticides monitored, 16 pesticides belonging to seven chemical families were detected, and 55% of the sediment samples were contaminated with one or more pesticide residues. The mean concentration(mg/kg dry weight(dw)) and detection frequency(%) of the four most frequently detected pesticides in the sediment samples were as follows: chlorpyrifos(0.18 mg/kg dw and 34%), p,p-DDE(0.018 mg/kg dw and 30%), cypermethrin(0.03 mg/kg dw and 14%), and deltamethrin(0.026 mg/kg dw and 13%). The spatial distribution exhibited that El-Rahawy had the highest pesticide load(2.86 mg/kg dw) among the studied sites, whereas the temporal variations revealed that the highest total pesticide concentrations were detected in winter season(1.73 mg/kg dw). Meanwhile, 12 pesticides showed high RQs(>1), posing a potential ecological risk to aquatic species that live and feed on such sediments.

关键词： Pesticide residues Sediments Spatiotemporal variations Risk quotient

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Adaptive Control System for Biogas Power Plant Using Model Predictive Control

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Journal of Modern Power Systems and Clean Energy 2021年第5期9卷 1193-1204页

作者： Samaa fawzy Mohammed Saeed Abdelfattah Eladl Magdi El-Saadawi Electrical Engineering Department Mansoura UniversityMansouraEgypt

This paper presents an adaptive control system using model predictive control for a biogas-fueled power *** control scheme is derived from an anaerobic digestion model that includes the concentration of biodegradable volatile solid in the reactor,the concentration of volatile solid in influent,the concentration of acidogens,and the concentration of *** these concentrations are the state variables of model predictive *** whole biogas-fueled power system has been modeled,implemented,and tested in MATLAB/Simulink *** validate the performance of the proposed controller,different operation conditions are studied and *** simulation results prove the effectiveness and the applicability of the proposed control system under different operating conditions.

关键词： Anaerobic digestion micro-turbine model predictive control state space biogas

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Introduction of longstanding complicated sulcus intraocular lens into the intact capsular bag

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International Journal of Ophthalmology(English edition) 2021年第11期14卷 1779-1783页

作者： Fathy fawzy Morkos Nader Fathy fawzy mohame. El Bahrawy Rania Serag Elkitkat Watany Research and Development Center Watany Eye HospitalCairo 11799Egypt Department of Ophthalmology Faculty of MedicineAin Shams UniversityCairo 11799Egypt

AIM:To propose a surgical technique that successfully reopened the empty and intact capsular bag after long periods of closure,with repositioning of the intraocular lens(IOL)from the ciliary sulcus into its preferred habitat inside the capsular ***:This is a case series,prospective,and interventional *** technique was first performed on an aphakic high myope with a closed posterior capsule for 18 ***,five patients with recurrently displaced sulcus IOLs for a range of 1 mo to 7 y were performed for the same *** surgery,identifying a"telltale white line"was an important landmark for detecting the site of major adhesions between the edge of the capsulorhexis and the posterior *** adhesions were freed using combined manual and viscoelastic dissection,followed by an easier freeing of adhesions along the whole capsular *** IOL was safely implanted,exchanged,or introduced from the sulcus into the fibrotic and closed capsular *** were followed up for a period ranging from 6 to 17 mo ***:All the patients experienced a remarkable improvement in their subjective *** lamp examination showed a postoperative centralized IOL in the *** follow up visits confirmed visual and IOL ***:This newly-introduced surgical technique facilitates the reopening of the empty yet intact capsular bag that has been closed by fibrotic proliferations,with secured implantation of the IOL inside the capsular *** with inadvertent implantation of IOLs into the ciliary sulcus,yet having an intact capsular bag,can benefit from this technique.

关键词： late in the bag technique displaced sulcus lOLs post cataract visual rehabilitation closed capsular lens bag

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Exploitation of Gene Expression and Cancer Biomarkers in Paving the Path to Era of Personalized Medicine

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Genomics, Proteomics & Bioinformatics 2017年第4期15卷 220-235页

作者： Hala fawzy mohame. Kamel Hiba Saeed A.Bagader Al-Amodi Biochemistry Department Faculty of Medicine Umm AL-Qura University Medical Biochemistry Department Faculty of Medicine Ain Shams University

Cancer therapy agents have been used extensively as cytotoxic drugs against tissue or organ of a specific type of cancer. With the better understanding of molecular mcchanislns undcrlying carcinogenesis and cellular events during cancer progression and metastasis, it is now possible to use targeted therapy for these molecular events. Targeted therapy is able to identify cancer patients with dissimilar genetic defects at cellular level for the same cancer type and consequently requires individualized approach for treatment. Cancer therapy begins to shill steadily from the tra- ditional approach of ＂one regimen for all patients＂ to a more individualized approach, through which each patient will be treated specifically according to their specific genetic defects. Personalized medicine accordingly requires identification of indicators or markers that guide in the decision mak- ing of such therapy to the chosen patients for more effective therapy. Cancer biomarkcrs are fre- quently used in clinical practice for diagnosis and prognosis, as well as identification ol responsive patients and prediction of treatment response of cancer patient. The rapid breakthrough and development of microarray and sequencing technologies is probably the main tool for paving the way toward ＂individualized biomarker-driven cancer therapy＂ or ＂personalized medicine＂. In this review, we aim to provide an updated knowledge and overview of the currcnt landscape of cancer biomarkers and their role in personalized medicine, emphasizing the impact of gcnomics Oil the implementation of new potential targeted therapies and development of novel cancer biomarkers in improving the outcome of cancer therapy.

关键词： Personalized medicine Gene expression Targeted therapy Predictive biomarkers Prognostic biomarkers

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Piezoelectric bimorph MEMS speakers

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Nanotechnology and Precision Engineering 2022年第3期5卷 1-8页

作者： Yiming Lang Chengze Liu Ahmed fawzy Chen Sun Shaobo Gong Menglun Zhang State Key Laboratory of Precision Measuring Technology and Instruments Tianjin UniversityTianjin 300072China Nanotechnology Central Lab Electronics Research Institute(ERI)Cairo 12622Egypt

One of the key requirements for MEMS speakers is to increase the sound pressure level(SPL)while keeping the size as small as *** this paper we present a MEMS speaker based on piezoelectric bimorph cantilevers that produces a higher SPL than conventional unimorph cantilever *** active diaphragm size is 1.4×1.4 mm^(2).The bimorph cantilevers are connected in parallel to make full use of the actuation *** 1 kHz,the measured SPL reached 73 dB and the peak SPL reached 102 dB at the resonance frequency of 10 kHz in a 711 ear simulator under a driving voltage of 10 V_(rms).The total harmonic distortion of the MEMS speaker was less than 3%in the range from 100 Hz to 20 *** the absolute SPL was not the highest,this work provides a better SPL for all piezoelectric MEMS speakers.

关键词： Piezoelectric Microspeaker Bimorph Aluminum nitride

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Trabeculectomy with Ologen implant versus mitomycin C in congenital glaucoma secondary to Sturge Weber Syndrome

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International Journal of Ophthalmology(English edition) 2018年第2期11卷 251-255页

作者： Thanaa Helmy mohame. Abdelrahman Gaber Salman Riham fawzy Elshinawy Department of Ophthalmology Ain Shams University

AIM： To compare the efficacy and safety of collagen matrix implant [Ologen（OLO） implant] versus mitomycin C（MMC） with subscleral trabeculectomy（SST） for the surgical treatment of congenital glaucoma（CG） in SturgeWeber Syndrome（SWS）.METHODS： A prospective comparative randomized study of 20 eyes of 16 patients with CG associated with SWS was divided into two groups. The first group（MMC Group） included 10 eyes that were subjected to SST with MMC. The second group（OLO Group） included 10 eyes that were subjected to trabeculectomy with a collagen matrix implant（OLO implant）. Postoperative evaluation included intraocular pressure（IOP） level, bleb evaluation, complications, and the need for further medication or surgical intervention. RESULTS： The mean preoperative IOP was 29±3.16 mm Hg in MMC and 29.8±3.08 mm Hg in OLO eyes. Mean 12-month percentage reduction in IOP was significant in both groups（57.9% and 56.3%）. At the end of the 12 postoperative follow-up month, in the MMC Group, 80% of eyes achieved the complete success, 20% of eyes had qualified success with no failed surgery in comparison to OLO Group which 70% of eyes achieved the complete success, 20% of eyes had qualified success with 10% failed surgery. In terms of complications, the MMC Group had a higher rate of complications than the OLO Group in the form of thin polycystic bleb in 6 eyes（60%）, blebitis in only one eye（10%） treated with topical antibiotics, shallow anterior chamber in two eyes（20%）.CONCLUSION： This study proves that the use of a collagen matrix implant yields equally effective results as MMC when combined with trabeculectomy for the treatment of CG in SWS. Furthermore, OLO implantation is safe and has low incidences of complications.

关键词： mitomycin C Ologen implants congenital glaucoma trabeculectomy Sturge-Weber Syndrome

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Peripartum depression and its predictors:A longitudinal observational hospital-based study

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World Journal of Psychiatry 2022年第8期12卷 1061-1075页

作者： Sherifa Ahmed Hamed mohame. Elwasify mohame. Abdelhafez mohame. fawzy Department of Neurology and Psychiatry Assiut University HospitalAssiut 71516Egypt Department of Psychiatry Mansoura UniversityMansoura 11001Egypt Department of Obstetrics and Gynecology Mansoura UniversityMansoura 11001Egypt

BACKGROUND Depression is a common problem in women in childbearing years due to burdens of motherhood and building a *** studies estimate the prevalence of antepartum depression compared to those in the postpartum *** To estimate the prevalence and the severities of peripartum depression and major depressive disorder and their *** This is a longitudinal observation *** included 200 women scoring≥13 with the Edinburgh Postpartum Depression Scale,indicating presence of symptoms of *** had a gestational age of≥6 wk and did follow-ups until the 10^(th) week to 12^(th) weeks *** of women's reactions to life circumstances and stressors during the current pregnancy were gathered from answers to questions of the designed unstructured clinical *** of depression,anxiety,and parenting stress were determined by the Beck Depression Inventory,State-Trait Anxiety Inventory for Adults,and Parenting Stress Index-Short Form,*** interviewing was done to confirm the diagnosis of major *** the levels of triiodothronine(T3),thyroxine(T4),and thyroid stimulating hormone(TSH)was done in both antepartum and postpartum *** Out of 968(mean age=27.35±6.42 years),20.66%(n=200)of the patients had clinically significant symptoms of depression and 7.44%had major *** premenstrual dysphoria,post-abortive depression,and depression unrelated to pregnancy and were reported in 43%,8%,and 4.5%of the patients,*** stressors were reported in 15.5%of the *** anxiety and parenting stress were reported in 90.5%and 65%of the patients,*** T3,T4,and TSH levels did not significantly differ from reference *** analysis showed that anxiety trait was a predictor for antepartum(standardized regression coefficients=0.514,t=8.507,P=0.001)and postpartum(standardized regression coefficients=0.573,t=0.04

关键词： Peripartum depression Antepartum depression Postpartum depression Anxiety Edinburgh postpartum depression scale Parenting stress

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Evaluation of chronic idiopathic tinnitus and its psychosocial triggers

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World Journal of Clinical Cases 2023年第14期11卷 3211-3223页

作者： Sherifa Ahmed Hamed Fadia Ahmed Attiah mohame. fawzy mohame. Azzam Department of Neurology and Psychiatry Assiut UniversityFaculty of MedicineAssiut 71516Egypt Department of Otolaryngology Assiut UniversityFaculty of MedicineAssiut 71516Egypt

BACKGROUND The tinnitus susceptibility patterns in relation to different psychological and life stressors are unknown in different *** To determine the comorbid psychosocial factors and behaviors associated with tinnitus and the predictors for the increase in its *** Participants were 230 adults(males=70;females=160;mean age=38.6±3.3).They underwent audiograms,speech discrimination and masking testing,and neuropsychiatric *** used for assessment included tinnitus handicap inventory,depression anxiety stress scale 21(DASS-21),perceived stress scale(PSS),and insomnia severity index(ISI).RESULTS Patients had mean duration of tinnitus of 11.5±2.5 *** had intact hearing perception at 250-8000 Hz and 95(41.3%)had aggravation of tinnitus loudness by masking *** tinnitus was reported in 77%(n=177).The majority had clinically significant insomnia(81.3%),somatic symptoms(75%)other than tinnitus and perceived moderate(46.1%)and high(44.3%)stress to *** severe/extremely severe symptoms of depression,anxiety and stress were reported in 17.4%,35.7%and 44.3%,*** with decompensated type had significantly higher scores for ISI(P=0.001)and DASS-21(depression=0.02,anxiety=0.01,stress=0.001)compared to those with compensated *** interviewing showed that 35.7%had non-specific anxiety disorder,17.4%had major depression,and 19.6%fulfilled the criteria of somatization *** analysis showed that the only independent predictors for tinnitus severity were the duration of tinnitus[odd ratios(OR)=0.832,95%CI:0.640-1.158;P=0.001]and PSS(OR=0.835,95%CI:0.540-1.125;P=0.001)*** To the best of our knowledge,this is the first study in our culture to evaluate the causal relationship between psychological factors and tinnitus onset,severity and *** could be the earliest and dominant somatic symptom induced by life stressors and psychological vulnerabilitie

关键词： Chronic tinnitus Idiopathic Stress Anxiety Insomnia Somatization Psychosocial factors

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